水分胁迫及复水对冬小麦粒叶比的影响

以北农6号为材料,采用温室管栽试验,研究了不同土壤水分条件对冬小麦粒叶比和产量的影响。结果表明,冬小麦粒叶比对水分变化十分敏感,水分胁迫抑制了叶片的光合活性,使粒叶比降低,产量减少。水分胁迫越重,粒叶比降低越多,产量越低;复水则使叶面积扩大,库容量提高,粒叶比升高,促进了同化物从源向库的运转,从而使产量增加。拔节期复水的处理,粒叶比提高最多,产量也最高,接近于一直保持充分供水的对照。其次是开花期复水的处理,而灌浆期复水增产效果最差。

Effect of water stress and rewatering on the grain-leaf ratio of winter wheat

Greenhouse experiments were carried out using wheat cultivars Beinong 6 as materials. The effect of soil water stress and rewatering on the grai n-leaf ratio and grain yield of winter wheat were analyzed. The results were as follows. The grainleaf ratio was quite sensitive to varied soil water conditio n. Water stress inhibited the photosynthetic activity of leafs, lowered the gra in-leaf ratio and grain yields. The more serious the water stress was, the more low the grain-leaf ratio and grain yields were. Rewatering increased the leaf areas, improve the sink capacity, enhanced the grain-leaf ratio, promoted the t ranslocation of assimilation product from the Source to the Sink, as a result th e grain yields increased. Rewatering during jointing stage had the best effect o n increasing the grain-leaf ratio and grain yields, in the next place was the flowering stage, while the effect of rewatering during filling stage on the incr easing of grain yields was the worst.